BlackRock Shares Plunge 3 as $740M Volume Sends It to 180th U.S. Equity Turnover Rank Amid Market Volatility

On October 10, 2025, BlackRock (BLK) closed with a 3.00% decline despite a 32.95% surge in trading volume to $0.74 billion, ranking it 180th among U.S. equities in daily turnover. The selloff occurred amid broader market volatility and shifting investor sentiment toward risk assets.

Market participants observed mixed signals in the asset management sector as year-end portfolio rebalancing efforts created uneven demand across fixed-income and equity strategies. BlackRock’s ETF division maintained its dominance in net inflows, though recent sector rotations suggested a temporary pullback in active equity mandates. Analyst commentary emphasized structural headwinds from rising benchmark yields, which compressed demand for duration-extended fixed-income products.

Back-test parameters for a dollar-volume-based strategy remain pending confirmation. The proposed methodology involves selecting 500 U.S.-listed stocks with the highest daily dollar volume for one-day holding periods. Key decisions required include weighting schemes (equal vs. value-weighted), transaction cost assumptions, and benchmark selection for performance comparison. Finalizing these parameters will enable execution of the historical simulation.